It's hard, especially when you start getting followers of your work and people who then somehow translate that into their own personal upliftment into you being the beacon of their life and how you shit rainbows, piss rosewater, and all your farts are fragrant.
Believing your own hype can lead to you not growing either personally or professionally, and possibly to being stupid in public.
There are three case studies of believing your own hype that has somehow warped into people making these people their own personal heroes: Rob Liefeld, Ales Kot, and Donald Trump.
Scary, I know.
You have to fight it. It's seductive. Ales Kot is relatively new to the scene, but for whatever reason, he has people kissing his ass. He's been known to whip up his followers to harass those who dare speak against him, when normal thinking people would look on, stupefied at what he initially said.
Rob Liefeld hasn't grown as an artist in over 20 years, and he's stupid in public a lot. One of his latest antics is promising to show a glimpse of pages for a book that he Kickstarted and should have shipped (shipped!) two years ago.
Donald Trump is just Donald Trump. His brand of rhetoric is terrifying because he's fearmongering as he continues his bid to become the leader of the free world...and some people are listening.
You can believe your own hype and be stupid, just don't do it in public or online.
There are plenty of private online venues to be stupid in. Twitter has direct messages where you can be stupid, possibly with a group of people. (If you didn't know that you can DM a group of people on Twitter now, then you haven't been keeping up with technology, which is an unwritten part of your job as a creator.) You can do the same thing on Facebook. Maybe on Google+ (if anyone still uses that). Get it out of your system away from prying eyes. Your professional life will be better for it.